AD9201ARS datasheet(12/21 Pages) AD

12 / 21 page

AD9201

–11–

REV. D

QREFT

QREFB

IREFT

0.1 F

10 F

0.1 F

AD9201

REFSENSE

AVSS

0.1 F

10 F

IREFB

VREF

0.1 F

10k

ADC

CORE

INTERNAL

CONTROL

LOGIC

10 F

0.1 F

Figure 26. Reference Buffer Equivalent Circuit and Exter-

nal Decoupling Recommendation

For best results in both noise suppression and robustness

against crosstalk, the 4 capacitor buffer decoupling arrangement

shown in Figure 26 is recommended. This decoupling should

feature chip capacitors located close to the converter IC. The

capacitors are connected to either IREFT/IREFB or QREFT/

QREFB. A connection to both sides is not required.

DRIVING THE AD9201

Figure 27 illustrates the use of an AD8051 to drive the AD9201.

Even though the AD8051 is specified with 3 V and 5 V power,

the best results are obtained at

±5 V power. The ADC input

span is 2 V.

ADC

VREF

AD8051

0.33 F

0.01 F

10pF

Figure 27.

–120

–110

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

0.0E+0

2.0E+6

1.0E+6

4.0E+6

6.0E+6

8.0E+6

10.0E+6

3.0E+6

5.0E+6

7.0E+6

9.0E+6

FUND

2ND

3RD

4TH

5TH

6TH

7TH

8TH

Figure 28. AD8051/AD9201 Performance

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